<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="/vue_basic/js/vue.js"></script>
    <title>计算属性</title>
</head>
<body>
    <div id="root">
                                <!-- 数据绑定 双向数据绑定 简写 -->
        姓:<input type="text" v-model="firstName"><br>
        名:<input type="text" v-model="lastName"><br>
        姓名:<span>{{firstName+'-'+lastName}}</span><br>
        <!-- 截取firstName前0,1,2位 -->
        姓名:<span>{{firstName.slice(0,3)}}-{{lastName}}</span>
    </div>
    
</body>
<script>
    new Vue({
        el:'#root',
        data:{
            firstName:'张',
            lastName:'三',
        },
        methods:{

        }
    })
</script>
</html>